1212203202001 has 27 divisors (see below), whose sum is σ = 1347103948827. Its totient is φ = 1089990990000.

The previous prime is 1212203201987. The next prime is 1212203202017. The reversal of 1212203202001 is 1002023022121.

It is a happy number.

The square root of 1212203202001 is 1101001.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1164670481601 + 47532720400 = 1079199^2 + 218020^2 .

It is not a de Polignac number, because 1212203202001 - 2¹⁷ = 1212203070929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212203202031) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1223211616 + ... + 1223212606.

Almost surely, 2^{1212203202001} is an apocalyptic number.

1212203202001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212203202001 is the 1101001-st square number.

1212203202001 is the 550501-st centered octagonal number.

It is an amenable number.

1212203202001 is a deficient number, since it is larger than the sum of its proper divisors (134900746826).

1212203202001 is an frugal number, since it uses more digits than its factorization.

1212203202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Multiplying 1212203202001 by its sum of digits (16), we get a square (19395251232016 = 4404004²).

Adding to 1212203202001 its reverse (1002023022121), we get a palindrome (2214226224122).

The spelling of 1212203202001 in words is "one trillion, two hundred twelve billion, two hundred three million, two hundred two thousand, one".